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When school lets out, Jordan Cullen logs on. As soon as she gets home, the 15-year-old settles in front of a computer and visits MySpace.com.

A world without the Web site "would ruin my social life, probably, because every day I look forward to getting online and going to MySpace," says Jordan, a sophomore at Summit Country Day who lives in Mount Lookout. "I love this."

She's among the more than 50 million registered users of My-Space, which launched two years ago. Purchased by Rupert Murdoch's News Corp. in July, it has become the most popular of the Internet's social networking sites, which ...